Tiny typo on numpy page

[Former user]

On this page https://bitbucket.org/pypy/numpy

git clone https://bitbucket.org/pypy/numpy.git; git checkout pypy-4.0.1

is missing the 'cd' part:

git clone https://bitbucket.org/pypy/numpy.git; cd numpy; git checkout pypy-4.0.1

[mattip]

fixed, thanks!